libfs: update kernel library references

lib/libfs/interface/close.c

@@ -1,7 +1,7 @@
 #include "../interface.h"
 
 #include <errno.h>
-#include <mango/status.h>
+#include <magenta/status.h>
 
 extern kern_status_t fs_msg_close(
 	xpc_context_t *ctx,

lib/libfs/interface/map.c

@@ -5,9 +5,9 @@
 #include <fs/context.h>
 #include <fs/file.h>
 #include <fs/status.h>
-#include <mango/handle.h>
-#include <mango/log.h>
-#include <mango/vm.h>
+#include <magenta/handle.h>
+#include <magenta/log.h>
+#include <magenta/vm.h>
 #include <sys/mman.h>
 
 static int create_file_mapping(

lib/libfs/interface/open.c

@@ -4,7 +4,7 @@
 #include <fs/context.h>
 #include <fs/file.h>
 #include <fs/status.h>
-#include <mango/log.h>
+#include <magenta/log.h>
 #include <stdio.h>
 
 extern kern_status_t fs_msg_open(